qunit test and error stack trace

test_and_error.coffee

exists = (selector) ->
  !!find(selector).length

module "Ember.js Library",
  setup: ->
    Ember.run App, App.advanceReadiness

  teardown: ->
    App.reset()

test "Check HTML is returned", ->
  visit("/").then ->
    ok exists("div"), "Found HTML!"
    


Tests completed in 137 milliseconds.
0 assertions of 1 passed, 1 failed.
Ember.js Library: Check HTML is returned (1, 0, 1)Rerun64 ms
Found HTML!
Source:   
    at http://localhost:3000/assets/features/testing_qunit_setup.js?body=1:19:14
    at invokeCallback (http://localhost:3000/assets/ember.js?body=1:8055:19)
    at null.<anonymous> (http://localhost:3000/assets/ember.js?body=1:8105:11)
    at EventTarget.trigger (http://localhost:3000/assets/ember.js?body=1:7878:22)
    at http://localhost:3000/assets/ember.js?body=1:8172:17
    at Object.DeferredActionQueues.flush (http://localhost:3000/assets/ember.js?body=1:5459:24)
    at Object.Backburner.end (http://localhost:3000/assets/ember.js?body=1:5545:27)
    at Object.Backburner.run (http://localhost:3000/assets/ember.js?body=1:5584:18)